Metal bed



FIG. 1 is a top plan view of a metal bed, showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a perspective view thereof. 

CLAIM The ornamental design for a metal bed, as shown and described. 